Messages in this thread | | | Date | Mon, 23 Apr 2007 12:10:42 -0700 | From | Jeremy Fitzhardinge <> | Subject | Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings |
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Eric W. Biederman wrote: > If (cpu_has_pse) it may only be an additional two pages. > INIT_MAP_BEYOND is currently mapping a lot more then that. >
Ah, yes. It allocates an extra two pages for pagetables, and then maps an extra 8MB or so.
>> Would that be necessary? Is there any need to remap it? Couldn't you >> just do the straightforward phys->virt mapping and use the page where it >> lies? >> > > Catch-22. If the page is not mapped yet you can't use it where it lies.
Why not? Er, except in the case where the page is needed to map itself - but that can be dealt with with a transient fixmap mapping.
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